Fix link to previous section

There's no `assets` section. Linking to `pagination` instead.
Add Emoji for Jekyll to plugin list.
Merge pull request #1708 from yihangho/add-emoji-plugin

Add Emoji for Jekyll to plugin list.
Update history to reflect merge of #1708
Merge pull request #1707 from localheinz/patch-1

Fix link to previous section
Update history to reflect merge of #1707